import 'package:english_words/english_words.dart' as prefix0;
import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page 2'),

      //注册路由表
      routes: {
        "new_page" :(context) =>NewRoute(),
        "new_page_arg" :(context) => EchoRoute(),
        "router_test_route":(context)=>RouterTestRoute(),
        "router_child":(context)=>UseEcho(),
        "router_3_widget":(context)=>Router3Widget(),
      },
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),

            //添加一个按钮
            FlatButton(
              child: Text("Open new route"),
              textColor: Colors.blue,
              onPressed: () {
                //导航到新路由
                Navigator.push(context,
                    MaterialPageRoute(builder: (context) {
                      return NewRoute();
                    })
                );
              },
            ),

            //打开TipPage的Button
            FlatButton(
              child: Text("打开传参页面"),
              textColor: Colors.amber,
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(builder: (context) {
                      return RouterTestRoute();
                    })
                );
              },
            ),


            //通过路由打开页面
            FlatButton(
              child: Text("使用命名路由打开页面"),
              textColor: Colors.brown,
              onPressed: (){
                Navigator.pushNamed(context, "new_page");
              },
            ),

            //路由命名打开页面并传递参数
            FlatButton(
              child: Text("带参数命名路由"),
              textColor: Colors.deepOrange,
              onPressed: (){
                Navigator.of(context).pushNamed("new_page_arg", arguments: "hi");
              },
            ),

            //第三方包显示字符
            RandomWordsWidget(),

            //打开子组件方式页面
            FlatButton(
              child: Text("子组件方式页面"),
              textColor: Colors.deepOrange,
              onPressed: (){
                Navigator.pushNamed(context, "router_child");
              },
            ),


            //第三章状态
            FlatButton(
              child: Text("组件状态"),
              textColor: Colors.deepOrange,
              onPressed: (){
                Navigator.pushNamed(context, "router_3_widget");
              },
            ),

          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

class NewRoute extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("New Route"),
      ),
      body: Center(
        child: Text("This is a route"),
      ),
    );
  }
}

class EchoRoute extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    var args = ModalRoute.of(context).settings.arguments;
    print(args);
    return Scaffold(
      appBar: AppBar(
        title: Text("New Route"),
      ),
      body: Center(
        child: Text("This is a route"),
      ),
    );
  }
}

class TipRoute extends StatelessWidget{

  TipRoute({
    Key key,
    @required this.text,
  }) :super(key: key);
  final String text;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("提示"),
      ),
      body: Padding(
        padding: EdgeInsets.all(18),
        child: Center(
          child: Column(
            children: <Widget>[
              Text(text),
              RaisedButton(
                onPressed: () => Navigator.pop(context, "我是返回值"),
                child: Text("返回"),
              )
            ],
          ),
        ),
      ),
    );
  }
}


class RouterTestRoute extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return Center(
      child: RaisedButton(
        onPressed: () async {
          var result = await Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) {
                return TipRoute(
                  text: "我是提示",
                );
              }
            )
          );

          print("路由返回值 $result");

        },

        child: Text("打开提示页"),
      ),
    );
  }
}


class RandomWordsWidget extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    final wordPair = new prefix0.WordPair.random();
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: new Text(wordPair.toString()),
    );
  }
}


class UseEcho extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Context测试"),
        ),
        body: Container(
          child: Builder(builder: (context) {
            Scaffold scaffold = context.ancestorWidgetOfExactType(Scaffold);
            print((scaffold.appBar as AppBar).title.toString());
            // TODO: implement build
            return Echo(text: "Echo 作为子组件",);
          }),
        ),
    );

  }
}

class Echo extends StatelessWidget {
  const Echo({
    Key key,
    @required this.text,
    this.backgroundColor: Colors.grey,
  }) :super(key: key);

  final String text;
  final Color backgroundColor;

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Container(
        color: backgroundColor,
        child: Text(text),
      ),
    );

  }
}

//第三章widget简介
class Router3Widget extends StatefulWidget{
  const Router3Widget({
    Key key,
    this.initValue: 0});
  final int initValue;

  @override
  _CounterWidgetState createState() => new _CounterWidgetState();
}

class _CounterWidgetState extends State<Router3Widget> {
  int _counter;

  @override
  void initState() {
    super.initState();
    //初始化状态
    _counter=widget.initValue;
    print("initState");
  }

  @override
  Widget build(BuildContext context) {
    print("build");
    return Scaffold(
      body: Center(
        child: FlatButton(
          child: Text('$_counter'),
          //点击后计数器自增
          onPressed:()=>setState(()=> ++_counter,
          ),
        ),
      ),
    );
  }

  @override
  void didUpdateWidget(Router3Widget oldWidget) {
    super.didUpdateWidget(oldWidget);
    print("didUpdateWidget");
  }

  @override
  void deactivate() {
    super.deactivate();
    print("deactive");
  }

  @override
  void dispose() {
    super.dispose();
    print("dispose");
  }

  @override
  void reassemble() {
    super.reassemble();
    print("reassemble");
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    print("didChangeDependencies");
  }

}